Thanks Youngbuck.
I looked through the mandatory parameters however (as one would expect) virtually all of them seem to be parameters suitable for accident reconstruction -- things like speed, altitude, control yolk position, ice detection -- but not necessarily useful for maintenance actions?
I imagine there's much more engineering-type data available from the QAR? I can't find a comprehensive list of QAR parameters for (say) an A320 or B737.
Question re: ACARS, for something like engine monitoring. Does the system regularly transmit engine health parameters (even when there's nothing wrong) -- or will ACARS messages get generated only when anomalies are detected / certain thresholds exceeded?
Thanks for your help.